Integer values are integer numbers from -230 to 230-1, that
is -1073741824 to 1073741823. The implementation may support a
wider range of integer values: on 64-bit platforms, the current
implementation supports integers ranging from -262 to 262-1.

Floating-point numbers

Floating-point values are numbers in floating-point representation.
The current implementation uses double-precision floating-point
numbers conforming to the IEEE 754 standard, with 53 bits of mantissa
and an exponent ranging from -1022 to 1023.

Characters

Character values are represented as 8-bit integers between 0 and 255.
Character codes between 0 and 127 are interpreted following the ASCII
standard. The current implementation interprets character codes
between 128 and 255 following the ISO 8859-1 standard.

Character strings

String values are finite sequences of characters. The current
implementation supports strings containing up to 224 - 5
characters (16777211 characters); on 64-bit platforms, the limit is
257 - 9.

Record values are labeled tuples of values. The record value written
{ field1 = v1; ...; fieldn = vn } associates the value
vi to the record field fieldi, for i = 1 ... n. The current
implementation supports records with up to 222 - 1 fields
(4194303 fields).

Arrays are finite, variable-sized sequences of values of the same
type. The current implementation supports arrays containing to
222 - 1 elements (4194303 elements); on 64-bit platforms, the
limit is 254 - 1

Variant values are either a constant constructor, or a pair of a
non-constant constructor and a value. The former case is written
constr; the latter case is written constr(v), where v is said
to be the argument of the non-constant constructor constr.

The following constants are treated like built-in constant
constructors:

Constant

Constructor

false

the boolean false

true

the boolean true

()

the ``unit'' value

[]

the empty list

The current implementation limits each variant type to have at most
246 non-constant constructors.

Polymorphic variants are an alternate form of variant values, not
belonging explicitly to a predefined variant type, and following
specific typing rules. They can be either constant, written
`tag-name, or non-constant, written `tag-name (v).

Objects are composed of a hidden internal state which is a
record of instance variables, and a set of methods for accessing and
modifying these variables. The structure of an object is described by
the toplevel class that created it.